CN105021877B - A kind of phase voltammetric meter of current transformer load measurement Smaller load in parallel - Google Patents
A kind of phase voltammetric meter of current transformer load measurement Smaller load in parallel Download PDFInfo
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Abstract
The present invention relates to a kind of phase voltammetric meter of current transformer load measurement Smaller load in parallel; it is connected in parallel on using multiple precision resisters in surveyed Current Transformer Secondary load; under the premise of ensureing that surveying secondary loop of mutual inductor does not open a way; low current signal is changed into voltage signal; high-tension electricity equipment protection phasor can be measured under Smaller load, the high-tension electricity equipment problem for needing a large amount of loads of tissue to carry out phasor measurement powered first is solved.Can under less than 10% load condition much smaller than custom requirements load check protection phasor correctness, equipment investment can be run early with on-load measurement current transform er secondary load.The load equipment that not only tissue can be avoided not debugged causes equipment to be easily damaged, and also reduces idle running equipment, saves a large amount of electric energy, it is ensured that electric power netting safe running.Among the inspection that the differential protection phasor of transformer or circuit can be widely used in.
Description
Technical field
The present invention relates to a kind of phase voltammetric meter of current transformer load measurement Smaller load in parallel, more particularly to one kind not
Need the current transformer load phase voltammetric meter in parallel for measuring Smaller load that table is clamped.
Background technology
When newly-built load transformer or circuit are put into first, such as large power plant is standby/and start and become or newly-built factories and miness
, it is necessary to which taking big load immediately after high-tension electricity equipment charge checks differential protection phasor when transformer is powered first.Protection
And meter phasor it is correct after could put into primary equipment and its main protection.The utensil of measurement phasor is clamp volt-ampere phase at present
Table.It, which measures electric current, is completed by the pliers of induced field, real in theory when the current minimum surveyed is 5 milliamperes
Due to the interference in other live loop magnetic fields on border, the current value generally surveyed is more than 10 MAHs, and clamp volt-ampere phase meter is
Current value and its phase can accurately be measured.
To ensure to have enough electric currents to ensure that clamp volt-ampere phase meter accurately measures phasor,《18 power networks are great anti-
Accident measure》The 15.5.6 articles specific provision：All differential protections (circuit, bus, transformer, reactor, generator etc.) exist
Before putting into operation, returned except phase loop and difference should be determined under conditions of load current is more than the 10% of current transformer rated current
Outside road, it is necessary to measure out-of-balance current, the voltage of each neutral conductor, to ensure the correct of protection device and second loop return wiring
Property.
But newly-built high-tension electricity equipment it is powered first after to take big load immediately relatively difficult, usual now a large amount of electricity
Gas driven equipment (load) is being installed or installed because no power supply did not carried out debugging.If at this moment organizing a large amount of electricity
Gas driven equipment rotating operation when not debugging, not only easily causes device damage accident, also because of a large amount of electric energy of idle running consumption, may be used also
Power equipment accident impact power system security can be caused.The volt-ampere phase meter of phasor can be measured just under Smaller load by developing
Above-mentioned problem can be cracked.
The content of the invention
(1) technical problem to be solved
The technical problem to be solved in the present invention, which is how to provide, can measure the volt-ampere phase of phasor under a kind of Smaller load
Table.
(2) technical scheme
In order to solve the above-mentioned technical problem, the invention provides a kind of phase of current transformer load measurement Smaller load in parallel
Position volt ampere meter, including current terminal, voltage terminal, first switch, divider resistance, PLC, display screen, battery, analog-to-digital conversion core
Piece, conversion handle；First resistor, second resistance, 3rd resistor, second switch, the 3rd switch, switch control chip；
Wherein divider resistance, PLC, display screen, modulus conversion chip, switch control chip are integrated on one piece of circuit board；
Current terminal has two terminals of Same Name of Ends and non-same polarity；Two current terminal standards are set on the outside of terminal to insert
Hole；Two p-wire plugs are inserted with two current terminal standard jacks, the opposite side plug of two p-wires is inserted into electric current and returned
Current terminal jack on road；Same Name of Ends terminal correspondence and the current terminal connection for surveying phase current loop, non-same polarity terminal
Correspondence is connected with phase current loop common port N line terminals are surveyed；First resistor and first switch are connected in series, second resistance and
Two switches are connected in series, and 3rd resistor and the 3rd switch are connected in series；These three series loops are connected in parallel with current terminal again；
Modulus conversion chip includes three road analog input loops；The first via analog quantity for being connected in parallel loop and modulus conversion chip is defeated
Enter connection；The output of modulus conversion chip and PLC input are connected, and modulus conversion chip is digital quantity analog quantity sample conversion
Give PLC；Controlled end and switch control chip the instruction output end connection of first switch, second switch, third switch, first opens
What pass, second switch, the 3rd switched cut-offs or closes by switch control chip instruction control；Switch control chip digital signal end
With the connection of PLC two-way signalings, sent according to PLC signal and instruction is opened or closed, and the state that switch is closed or is disconnected is believed
Number give PLC；
Voltage terminal has two terminals of Same Name of Ends and non-same polarity；Signal on the inside of two terminals respectively with divider resistance is defeated
Enter and be set to two standard jacks on the outside of two ends connection, two terminals；Two standard jacks plug two test pencil lines respectively, of the same name
End connects test pencil line other end and is connected with the separate terminal of surveyed voltage, and non-same polarity connects test pencil line other end with surveying mutually electricity
The common port N line terminals connection of pressure；The output end of divider resistance and the 3rd road analog input connection of modulus conversion chip, point
Piezoresistance gives modulus conversion chip the voltage signal that the voltage signal that voltage terminal is sent is converted into 0.01 times；
The gear output and PLC input for changing handle are connected, and PLC is given measurement gear signal；
PLC output and the input connection of display screen；Measurement amount data signal that PLC is sent according to modulus conversion chip and
The gear signal that conversion handle is sent calculates corresponding amplitude and phase, and shows on a display screen；
Battery provides power supply to PLC, display screen and modulus conversion chip.
Preferably, the current terminal includes first via current terminal, the second road current terminal；The first switch includes
First via first switch, the second tunnel first switch；The first resistor includes first via first resistor, the second tunnel first resistor；
Second resistance includes first via second resistance, the second tunnel second resistance；3rd resistor includes first via 3rd resistor, the second tunnel the
Three resistance；Second switch includes first via second switch, the second road second switch；3rd switch include the first via the 3rd switch,
Second tunnel the 3rd is switched；
Preferably, conversion handle have voltage magnitude, first via current amplitude, the second road current amplitude, first via electric current and
Second tunnel current phase, voltage and first via current phase, voltage and the second tunnel current phase measure gear for totally six.
Preferably, first via first resistor, first via second resistance, first via 3rd resistor resistance be followed successively by r, 0.5r,
0.25r, resistance storage is solidificated in PLC；First via first switch, first via second switch, the switch of the first via the 3rd are controllable
Switch；
Second tunnel first resistor, the second tunnel second resistance, the second tunnel 3rd resistor resistance are followed successively by r, 0.5r, 0.25r；Resistance
Value storage is solidificated in PLC；Second tunnel first switch, the second road second switch, the second tunnel the 3rd switch are gate-controlled switches.
(3) beneficial effect
A kind of phase voltammetric meter of current transformer load measurement Smaller load in parallel of the present invention, utilizes multiple high precision electros
Resistance is connected in parallel in surveyed Current Transformer Secondary load, under the premise of ensureing that surveying secondary loop of mutual inductor does not open a way,
Low current signal is changed into voltage signal, and high-tension electricity equipment protection phasor can be measured under Smaller load, overcomes clamp volt
Peace phase meter can not measure the birth defect of low current, also eliminate the table pincers of clamp volt-ampere phase meter so that measurement process is more
For convenience, quick, safety, solves the high-tension electricity equipment difficulty for needing a large amount of loads of tissue to carry out phasor measurements powered first
Topic.Can under less than 10% load condition much smaller than custom requirements load check protection phasor correctness, can be with
On-load measurement current transform er secondary load, early can run equipment investment.It can not only avoid what tissue had not been debugged
Load equipment causes equipment to be easily damaged, and also reduces idle running equipment, saves a large amount of electric energy, it is ensured that electric power netting safe running.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1：A kind of structure of the phase voltammetric meter for current transformer load measurement Smaller load in parallel that the present invention is provided connects
Connect schematic diagram；
In figure：1st, first via current terminal；2nd, the second road current terminal；3rd, voltage terminal；4th, first via first switch；5、
Second tunnel first switch；6th, divider resistance；7、PLC；8th, display screen；9th, battery；10th, modulus conversion chip；11st, handle is changed；
12nd, first via first resistor；13rd, first via second resistance；14th, first via 3rd resistor；15th, the second tunnel first resistor；16th,
Two tunnel second resistances；17th, the second tunnel 3rd resistor；18th, first via second switch；19th, the first via the 3rd is switched；20th, the second tunnel
Second switch；21st, the second tunnel the 3rd is switched；22nd, switch control chip.
Embodiment
Embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples.Following examples are used for
Illustrate the present invention, but can not be used for limiting the scope of the present invention.
As shown in figure 1, a kind of phase voltammetric meter of current transformer load measurement Smaller load in parallel of the present embodiment, including
First via current terminal 1, the second road current terminal 2, voltage terminal 3, first via first switch 4, the second tunnel first switch 5, point
Piezoresistance 6, PLC7, display screen 8, battery 9, modulus conversion chip 10, conversion handle 11.First via first resistor 12, the first via
Second resistance 13, first via 3rd resistor 14, the second tunnel first resistor 15, the second tunnel second resistance 16, the second tunnel 3rd resistor
17th, first via second switch 18, the first via the 3rd switch the 19, second road second switch 20, the second tunnel the 3rd switch 21, switch control
Coremaking piece 22.Divider resistance 6, PLC7, display screen 8, modulus conversion chip 10, switch control chip 22 are integrated in one piece of circuit board
On.
First via current terminal 1 has two terminals of Same Name of Ends and non-same polarity.Current terminal standard is set on the outside of terminal
Jack.The jack of two terminals plugs the plug of two p-wires, the opposite side plug of two p-wires respectively during measurement phasor
It is inserted into the current terminal jack on current loop.Same Name of Ends terminal correspondence and the current terminal connection for surveying phase current loop, it is non-
Same Name of Ends terminal correspondence is connected with phase current loop common port N line terminals are surveyed.
Second road current terminal 2 has two terminals of Same Name of Ends and non-same polarity.Current terminal standard is set on the outside of terminal
Jack.The jack of two terminals plugs the plug of two p-wires, the opposite side plug of two p-wires respectively during measurement phasor
It is inserted into the current terminal jack on current loop.Same Name of Ends terminal correspondence and the current terminal connection for surveying phase current loop, it is non-
Same Name of Ends terminal correspondence is connected with phase current loop common port N line terminals are surveyed.
The road current terminal 2 of first via current terminal 1 and second can be used alone according to measurement needs, can also make simultaneously
With.
Voltage terminal 3 has two terminals of Same Name of Ends and non-same polarity.Two ends on the inside of terminal respectively with divider resistance 6 connect
Connect, standard jacks are set on the outside of terminal.The jack of two terminals plugs two test pencil lines, Same Name of Ends institute respectively during measurement phasor
Even the connection of test pencil line other end is surveyed the separate terminal of voltage and is connected, and non-same polarity connects test pencil line other end and connects that to survey phase electric
The common port N line terminals connection of pressure.
First via first resistor 12, first via second resistance 13, first via 3rd resistor 14 are all precision resister, resistance
It is followed successively by r, 0.5r, 0.25r.Resistance storage is solidificated in PLC.First via first switch 4, first via second switch 18, first
The switch of road the 3rd 19 is gate-controlled switch, cut-offs or closes by the instruction control of switch control chip 22.The He of first via first resistor 12
First via first switch 4 is connected, and first via second resistance 13 and first via second switch 18 are connected, the He of first via 3rd resistor 14
The switch of the first via the 3rd 19 is connected.These three series loops are in parallel with first via current terminal 1 again, and the voltage of shunt circuit
Signal gives modulus conversion chip 10.Second tunnel first resistor 15, the second tunnel second resistance 16, the second tunnel 3rd resistor 17 are all
Precision resister, resistance is followed successively by r, 0.5r, 0.25r.Resistance storage is solidificated in PLC.Second tunnel first switch 5, the second tunnel
Second switch 20, the second tunnel the 3rd switch 21 are gate-controlled switches, cut-off or close by the instruction control of switch control chip 22.Second
The tunnel first switch 5 of road first resistor 15 and second is connected, and the second tunnel second resistance 16 and the second road second switch 20 are connected, and second
The tunnel the 3rd of road 3rd resistor 17 and second switch 21 is connected.These three series loops are in parallel with the second road current terminal 2 again, and handle
The voltage signal of shunt circuit gives modulus conversion chip 10.Divider resistance 6 is a high internal resistance divider, voltage terminal 3
The voltage signal that the voltage signal sent is converted into 0.01 times gives modulus conversion chip 10.
Modulus conversion chip 10 is digital quantity analog quantity sample conversion；And give PLC7.The He of switch control chip 22
PLC7 two-way signalings are connected, and sent according to PLC7 signal and instruction is opened or closed.And switch closure or off-state signal
Give PLC.Conversion handle 11 has voltage magnitude, first via current amplitude, the second road current amplitude, first via electric current and the second tunnel
Current phase, voltage and first via current phase, voltage and the second tunnel current phase measure gear for totally six.Measure gear signal
Give PLC7.
The gear signal that the measurement signal and conversion handle 11 that PLC7 is sent according to modulus conversion chip 10 are sent calculates phase
The amplitude and phase answered, and shown on display screen 8.
Battery 9 provides power supply to PLC7, display screen 8 and modulus conversion chip 10.
The phase voltammetric meter measurement magnitude of voltage process of current transformer load measurement Smaller load in parallel is as follows：Change handle 11
Magnitude of voltage gear is pulled, voltage terminal surveys voltage terminal 3 by the connection of test pencil line, and modulus conversion chip 10 changes the voltage and is
Data signal gives PLC7, and PLC7 is shown using magnitude of voltage conversion actual voltage value on display screen 8.
Current value on the phase voltammetric meter measurement first via current terminal 1 of current transformer load measurement Smaller load in parallel
Process it is as follows：First via current terminal 1 and surveys after current terminal connection, conversion handle 11 selects first via current amplitude grade
Position.PLC7 is sent instructions by switch control chip 22 simultaneously switches off first via first switch 4, the second tunnel first switch 5, the first via
Second switch 18, the first via the 3rd switch the 19, second road second switch 20, the second tunnel the 3rd switch 21.Modulus conversion chip 10
Change the voltage on first via current terminal and PLC7 is given into data signal, PLC7 stores the magnitude of voltage for U10.PLC7 is by opening
Pass control chip 22, which sends instructions, closes first via first switch 4, and first via first resistor 12 and first via current terminal 1 are in parallel.
The magnitude of voltage of first via current terminal 1 changes, and the voltage on the conversion first via of modulus conversion chip 10 current terminal 1 is numeral
Signal gives PLC7.PLC7 stores the magnitude of voltage for U11.PLC7 calculates the absolute value │ U10-U11 │ of U10 and U11 difference, and
Take the maximum max (│ U10 │, │ U11 │) in U10, U11 absolute value.If │ U10-U11 │/max (│ U10 │, │ U11 │) are big
When equal to 0.1.PLC7 following formulas, which are calculated, to be surveyed current terminal load and is shown in display screen 8：Under
Formula calculates and surveys current terminal current value and shown in display screen 8：If │ U10-U11 │/max (│ U10 │, │
U11 │) when being less than 0.1, PLC7 is sent instructions disconnection first via first switch 4 by switch control chip 22, closes the first via second
Switch 18, the magnitude of voltage of first via current terminal 1 changes, the electricity on the conversion first via of modulus conversion chip 10 current terminal 1
Press and give PLC7 for data signal.PLC7 stores the magnitude of voltage for U12.PLC7 calculates the absolute value │ of U10 and U12 difference
U10-U12 │, and take the maximum max (│ U10 │, │ U12 │) in U10, U12 absolute value.If │ U10-U12 │/max (│ U10 │,
│ U12 │) be more than or equal to 0.1 when.PLC7 following formulas, which are calculated, to be surveyed current terminal load and is shown in display screen 8：Calculated with following formula and survey current terminal current value and shown in display screen 8：
If │ U10-U12 │/max (U10, U12) is less than 0.1.PLC7 is sent instructions by switch control chip 22 disconnects the first via second
Switch 18, the closure first via the 3rd switch 19, the magnitude of voltage of first via current terminal 1 is changed, and modulus conversion chip 10 is changed
Voltage on first via current terminal 1 gives PLC7 for data signal.PLC7 stores the magnitude of voltage for U13.PLC7 following formula meters
Calculation surveys current terminal 1 and loads and shown in display screen 8：Calculated with following formula and survey current terminal electricity
Flow valuve is simultaneously shown in display screen 8：The whole process of the current value of measurement first via current terminal 1 all has
It is automatically performed under PLC8 controls.First via first resistor 12, first via second resistance 13, the resistance of first via 3rd resistor 14 are successively
For r, 0.5r, 0.25r, resistance difference is larger, it is ensured that the calculating convergence in said process.
The phase voltammetric meter of current transformer load measurement Smaller load in parallel measures the current value on the second road current terminal 2
Process it is as follows：Second road current terminal 2 and surveys after current terminal connection, conversion handle 11 selects the second road current amplitude grade
Position.PLC7 is sent instructions by switch control chip 22 simultaneously switches off first via first switch 4, the second tunnel first switch 5, the first via
Second switch 18, the first via the 3rd switch the 19, second road second switch 20, the second tunnel the 3rd switch 21.Modulus conversion chip 10
Change the voltage on the second road current terminal 2 and PLC7 is given into data signal, PLC7 stores the magnitude of voltage for U20.PLC7 passes through
Switch control chip 22, which sends instructions, closes the second tunnel first switch 5, and the second tunnel first resistor 15 and the second road current terminal 2 are simultaneously
Connection.The magnitude of voltage of second road current terminal 2 changes, and the voltage that modulus conversion chip 10 is changed on the second road current terminal 2 is
Data signal gives PLC7.PLC7 stores the magnitude of voltage for U21.PLC calculates the absolute value │ U20-U21 of U20 and U21 difference
│, and take the maximum max (│ U20 │, │ U21 │) in U20, U21 absolute value.If │ U20-U21 │/max (│ U20 │, │ U21 │)
During more than or equal to 0.1.PLC7 following formulas, which are calculated, to be surveyed current terminal load and is shown in display screen 8：With
Following formula calculates and surveys current terminal current value and shown in display screen 8：If │ U10-U11 │/max (│ U20
│, │ U21 │) be less than 0.1 when, PLC7 by switch control chip 22 send instructions disconnection the second tunnel first switch 5, close the second tunnel
Second switch 20, the magnitude of voltage of the second road current terminal 2 is changed, and modulus conversion chip 10 is changed on the second road current terminal 2
Voltage give PLC7 for data signal.PLC7 stores the magnitude of voltage for U22.PLC calculates the absolute value │ of U20 and U22 difference
U20-U22 │, and take the maximum max (│ U20 │, │ U22 │) in U20, U22 absolute value.If │ U20-U22 │/max (│ U20 │,
│ U22 │) be more than or equal to 0.1 when.PLC7 following formulas, which are calculated, to be surveyed current terminal load and is shown in display screen 8：Calculated with following formula and survey current terminal current value and shown in display screen 8：
If │ U20-U22 │/max (│ U20 │, │ U22 │) are less than 0.1.PLC7 is sent instructions by switch control chip 22 disconnects the second tunnel
Second switch 20, the second tunnel the 3rd of closure switch 21, the magnitude of voltage of the second road current terminal 2 changes, modulus conversion chip 10
The voltage changed on the second road current terminal 2 gives PLC7 into data signal.PLC7 stores the magnitude of voltage for U23.Under PLC7 is used
Formula, which is calculated, to be surveyed current terminal load and is shown in display screen 8：Calculated with following formula and survey current terminal
Electron current value is simultaneously shown in display screen 8：Measure the whole process of the current value of the second road current terminal 2
All it is to have be automatically performed under PLC7 controls.Second tunnel first resistor 15, the second tunnel second resistance 16, the second tunnel 3rd resistor 17 hinder
Value is followed successively by r, 0.5r, 0.25r, and resistance difference is larger, it is ensured that the calculating convergence in said process.
The phase voltammetric meter measurement first via electric current and the second road electric current phase of current transformer load measurement Smaller load in parallel
Position process is as follows：Conversion handle pulls 11 and arrives first via electric current and the second tunnel current phase gear, is loaded according to above-mentioned current transformer
The phase voltammetric meter measurement first via electric current and the second road current course of parallel connection measurement Smaller load, PLC7 obtain first via current terminal
After sub 1 current value, the current value of the second road current terminal 2, phase is calculated, phase value is shown on display screen 8.
The phase voltammetric meter measurement voltage and first via current phase process of current transformer load measurement Smaller load in parallel
It is as follows：Conversion handle pulls 11 and arrives voltage and first via current phase gear, small negative according to above-mentioned current transformer load measurement in parallel
The phase voltammetric meter measurement voltage and first via current course of lotus, PLC7 obtain the voltage of voltage terminal 3, first via current terminal 1
After current value, phase is calculated, phase value is shown on display screen 8.
The phase voltammetric meter measurement voltage and the second tunnel current phase process of current transformer load measurement Smaller load in parallel
It is as follows：Conversion handle pulls 11 and arrives voltage and the second tunnel current phase gear, small negative according to above-mentioned current transformer load measurement in parallel
The phase voltammetric meter measurement voltage of lotus and the second road current course, PLC7 obtain the voltage of voltage terminal 3, the second road current terminal 2
After current value, phase is calculated, phase value is shown on display screen 8.
Embodiment of above is merely to illustrate the present invention, rather than limitation of the present invention.Although with reference to embodiment to this hair
It is bright to be described in detail, it will be understood by those within the art that, to technical scheme carry out it is various combination,
Modification or equivalent, without departure from the spirit and scope of technical solution of the present invention, the right that all should cover in the present invention is wanted
Ask among scope.
Claims (4)
1. a kind of phase voltammetric meter of current transformer load measurement Smaller load in parallel, including current terminal, voltage terminal (3),
First switch, divider resistance (6), PLC (7), display screen (8), battery (9), modulus conversion chip (10), conversion handle (11)；
First resistor, second resistance, 3rd resistor, second switch, the 3rd switch, switch control chip (22)；
Wherein divider resistance (6), PLC (7), display screen (8), modulus conversion chip (10), switch control chip (22) are integrated in
On one piece of circuit board；
Current terminal has two terminals of Same Name of Ends and non-same polarity；Two current terminal standard jacks are set on the outside of terminal；Two
Two p-wire plugs are inserted with individual current terminal standard jacks, the opposite side plug of two p-wires is inserted on current loop
Current terminal jack；Same Name of Ends terminal correspondence and the current terminal connection for surveying phase current loop, non-same polarity terminal it is corresponding with
Surveyed phase current loop common port N line terminals connection；First resistor and first switch are connected in series, second resistance and second switch
It is connected in series, 3rd resistor and the 3rd switch are connected in series；These three series loops are connected in parallel with current terminal again；Modulus turns
Changing chip (10) includes three road analog input loops；It is connected in parallel the first via analog quantity of loop and modulus conversion chip (10)
Input connection；The output of modulus conversion chip (10) and PLC (7) input connection, modulus conversion chip (10) adopt analog quantity
Sample is converted to digital quantity and gives PLC (7)；The controlled end and switch control chip (22) of first switch, second switch, third switch
Instruction output end is connected, and cut-offfing or closing to be instructed by switch control chip (22) for first switch, second switch, third switch is controlled
System；Switch control chip (22) digital signal end and PLC (7) two-way signaling connection, according to PLC (7) signal send disconnection or
Close command, and the status signal that switch is closed or disconnected gives PLC (7)；
Voltage terminal (3) has two terminals of Same Name of Ends and non-same polarity；Signal on the inside of two terminals respectively with divider resistance is defeated
Enter and be set to two standard jacks on the outside of two ends connection, two terminals；Two standard jacks plug two test pencil lines respectively, of the same name
End connects test pencil line other end and is connected with the separate terminal of surveyed voltage, and non-same polarity connects test pencil line other end with surveying mutually electricity
The common port N line terminals connection of pressure；
The output end of divider resistance (6) and the 3rd road analog input connection of modulus conversion chip 10, divider resistance (6) is electricity
The voltage signal that the voltage signal that pressure side is sent is converted into 0.01 times gives modulus conversion chip (10)；
The gear output and PLC (7) input for changing handle (11) are connected, and PLC (7) is given measurement gear signal；
PLC (7) output and the input connection of display screen (8)；The measurement amount that PLC (7) is sent according to modulus conversion chip (10)
The gear signal that data signal and conversion handle (11) are sent calculates corresponding amplitude and phase, and is shown on display screen (8)
Out；
Battery (9) provides power supply to PLC (7), display screen (8) and modulus conversion chip (10).
2. the phase voltammetric meter of current transformer load measurement Smaller load in parallel according to claim 1, it is characterised in that
The current terminal includes first via current terminal (1), the second road current terminal (2)；The first switch includes the first via the
One switch (4), the second tunnel first switch (5)；The first resistor includes first via first resistor (12), the second tunnel first resistor
(15)；Second resistance includes first via second resistance (13), the second tunnel second resistance (16)；3rd resistor includes the first via the 3rd
Resistance (14), the second tunnel 3rd resistor (17)；Second switch includes first via second switch (18), the second road second switch
(20)；3rd switch includes the switch of the first via the 3rd (19), the second tunnel the 3rd switch (21).
3. the phase voltammetric meter of current transformer load measurement Smaller load in parallel according to claim 1 or 2, its feature exists
In conversion handle (11) has voltage magnitude, first via current amplitude, the second road current amplitude, first via electric current and the second road electricity
Flow phase, voltage and first via current phase, voltage and the second tunnel current phase and measure gear for totally six.
4. the phase voltammetric meter of current transformer load measurement Smaller load in parallel according to claim 2, it is characterised in that
First via first resistor, first via second resistance, first via 3rd resistor resistance are followed successively by r, 0.5r, 0.25r, and resistance storage is solid
Change in PLC；First via first switch, first via second switch, the switch of the first via the 3rd are gate-controlled switches；
Second tunnel first resistor, the second tunnel second resistance, the second tunnel 3rd resistor resistance are followed successively by r, 0.5r, 0.25r；Resistance is deposited
Storage is solidificated in PLC；Second tunnel first switch, the second road second switch, the second tunnel the 3rd switch are gate-controlled switches.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410176204.0A CN105021877B (en) | 2014-04-29 | 2014-04-29 | A kind of phase voltammetric meter of current transformer load measurement Smaller load in parallel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410176204.0A CN105021877B (en) | 2014-04-29 | 2014-04-29 | A kind of phase voltammetric meter of current transformer load measurement Smaller load in parallel |
Publications (2)
| Publication Number | Publication Date |
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| CN105021877A CN105021877A (en) | 2015-11-04 |
| CN105021877B true CN105021877B (en) | 2017-07-18 |
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